Final answer:
The imprisonment referred to is likely a confusion between literature and history; Danglars is a character from 'The Count of Monte Cristo' while the Dreyfus Affair involves Alfred Dreyfus. Danglars' fictional imprisonment was orchestrated by characters in Dumas's novel, while Dreyfus's actual wrongful imprisonment was due to anti-Semitic elements within the French military and government.
Step-by-step explanation:
The question "Who was really behind Danglars' imprisonment?" seems to be a mix-up of literary plots rather than a historical inquiry. From the references mentioned, it appears you may be conflating characters and situations from Alexandre Dumas's The Count of Monte Cristo with the historical Dreyfus Affair.
In Dumas's novel, the character Danglars is a banker who becomes an antagonist to the protagonist Edmond Dantès and is /ultimately responsible for Dantès's wrongful imprisonment.
On the other hand, the Dreyfus Affair was a political scandal that involved Alfred Dreyfus, a Jewish French army officer wrongfully accused of treason. His imprisonment was the result of anti-Semitic sentiment and military cover-ups.
To more accurately answer the question regarding who was behind Danglars' imprisonment, in the literary context, it would be the characters Fernand Mondego and Villefort, acting on jealousy and self-protection, respectively. For the Dreyfus Affair, it was elements within the French army and establishment driven by anti-Semitism and a desire to protect the military's reputation.